MP3388

NRFND

4.5V-25Vin, 50Vout, 8-Channel Boost WLED Driver



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Product Description

The MP3388 is a step-up converter with 8-channel current sources designed for driving the white LED arrays for large size LCD panel backlighting applications. The MP3388 uses current mode, fixed frequency architecture. The switching frequency can be selected at 1.25MHz or 625kHz. It generates an output voltage up to 50V from a 4.5V to 25V input supply. The MP3388 independently regulates the current in each LED string to the user programmed value set by an external current setting resistor. The MP3388 applies 8 internal current sources in each LED string terminal to achieve a current balance of ±3% regulation accuracy between strings. Its low 600mV regulation voltage on LED current sources reduces power loss and improves efficiency. The MP3388 features external PWM dimming or DC input PWM dimming, which allows the flexible control of the backlighting luminance.. The dimming PWM signal can be generated internally, and the dimming frequency is programmed by an external setting capacitor.

Product Features

  • High Efficiency and Small Size
  • 4.5V to 25V Input Voltage Range
  • 50V Maximum Step-up Voltage
  • Balanced Driver for 8 Strings of WLED
  • ±3% Current Matching Accuracy Between Strings
  • Selectable Switching Frequency: 1.25MHz or 625kHz
  • PWM or DC Input Burst PWM Dimming
  • Programmable Over-voltage Protection
  • Under Voltage Lockout
  • Open and Short LED protection
  • Thermal Shutdown

Parametrics

  • Isw Limit (A)2
  • Ishutdown (µA)2
  • Vin (min) (V)4.5
  • Vin (max) (V)25
  • Channels8
  • fsw (min) (kHz)625
  • Ichannel (max) (A)0.03
  • LEDx ABS Voltage (V)50
  • fsw (max) (kHz)1250
  • Vout (max) (V)50
  • Vfb (V)0.6
  • GradeCatalog
  • Rds(on) (mΩ)180
  • PackageQFN-24 (4x4), SOIC-28
  • Power MOSFETIntegrated
  • TopologyBoost
  • Dimming (Output)P-Dim
  • Iq (mA)1.8
  • Typical LCD Screen SizesMedium (10"-29")
  • Other FeaturesOutput/Input Disconnect

Evaluation Kit

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Kit details

The EV3388DR-00A is an evaluation board for the MP3388DR, a step-up converter designed for large liquid-crystal displays that employ an array of LEDs as the light source. It can drive up to 8 strings in parallel and 10 LEDs per string.

The MP3388 uses internal switch current mode, fixed frequency architecture and includes current ballast in each string terminal, which achieves ±3% current regulation accuracy between strings. Low feedback voltage at each LED string help reduce power loss and improve efficiency.

The MP3388 has multiple features to protect the converter from fault conditions, including under-voltage lockout, current limiting, over voltage, short LED, open LED and thermal shut-down protection.

The MP3388 is available in small QFN24 (4mmx 4mm) package.

US$ 100.00 + tax